June slowly pulled out of Ty and looked down at her, satisfied at seeing the young woman lying there filled up with his cum. He had dreamt of getting to do this to someone for years, though he never imagined doing it to his adoptive child- not that Ty felt like anything close to that by now.
He leaned down to put his mouth next to Ty's ear again, and whispered to the girl, "Now give me my litter. Make them gestate inside you and then birth them for your daddy to see."
Ty felt herself grow still more shamefully aroused at June's demand, and wished for herself to painlessly bear June's many babies. Inside herself, she saw the fertilized eggs in her womb start to develop and grow, gestating in her body, and her stomach and breasts gradually grew in turn.
Her petite tummy swelled far beyond its normal capacity, soon getting so large her navel distended and a seam and stretch marks emerged across it. Still it continued to expand, the hands and feet of her babies pressing at her skin from within her womb.
Her boobs expanded several cup sizes, getting more weighty and developed so as to feed her offspring once she birthed them, and her nipples grew more pert and sensitive, aching to be sucked and have some of the milk her body was producing release from them.
Once her body had grown to most of the nine months in, Ty was so full of babies she couldn't even stand herself up. Seeing June standing over her satisfied made her realize something she found weirdly, shamefully arousing- she felt claimed by this man. Her body was his now, just as he had changed her body a little while ago.
June bent down and whispered to Ty again. "Now, birth them," he ordered. Ty did as he asked, and felt her water break and her body practically fall open to allow her to bear his children. She lost count of how many emerged from her, and to her relief June helped position them to suckle at her breasts as she focused on contracting her muscles enough to birth each one.
Once they were all born, June kissed Ty passionately, and told her, "You're a good fucking mom. In fact, now I'd say you're a MILF."